Developing Codex: Squats - Army Characteristics

The next part of my development of the Squats codex is to think about the characteristics of the army - that is, how will the army play in a typical game. After some brainstorming, I've decided on the following:

Squat 'Race' Characteristics:

• Resolute, tough, strong-minded
• Unlikely to fall back or be affected by negative psychology
• High tendancy to hold grudges ('Book of Grudges'??)
• Naturally resiliant to opponent's pychic powers
• Few psychic powers / psykers in army
• Ancestor Lord will be only psyker
• Squat psychic powers will be defensive and/or synergistic (ie upgrading troop charactistics or powers, similar to Eldar Doom & Guide powers)
• Mechanically & technologically highly adept (with particular aptitude toward plasma and energy weapons)
• Subterranean dwellers

Squat Technology:

•  Widespread use of tunnelling machines (Termite transports etc) - all transports arrive from deepstrike in a similar way to Space Marine Drop Pods (ie half arrive on turn one, rest arrive from reserve)
• Tunnellers cause hits (large blast template?) on opposing models when arriving
• Opponent's vehicles stand chance of falling into subterranean tunnels, depending on number of tunnellers in Squat army
• Use of air balloons & air-ships - slow moving but stable weapon platforms
• Reconnaisance 'Spotter' air balloon allows units out of line-of-sight to use balloon's LoS for targetting blasts & barrages
• Light infantry armour (5+)
• Unit upgrade to provide 3+ / 4+ (?) cover save (vs. ballistic shots only) from 'energy bubble generator'
•  Sappers (scouts) allow areas of terrain to be secretly nominated as difficult/dangerous and booby-trapped land

One thing I will not be doing is limiting the army's 'foot' speed. I think that would fly in the face of every other race currently in 40k. If 6th edition brings in variable movement speeds (eg Tyranids, Eldar moving possibly 8"?) then I would consider dropping the Squats down to 4", but until that time, everything (from Genestealers to Ratlings) stay at 6".

As I start developing rules and stats for individual units, I will use the above characteristics as a general guide, and flesh out some of those points in more detail to hopefully make a really unique army!